figure



P 10, 1963 F. F. CHELLIS ETAL 3,103,574

ARC IMAGE FURNACE 5 Sheets-Sheet 1 Filed Dec. 5, 1959 -H IFM 3 m QmINVENTORS freofic/ze/us )Zefer B 5 670-68)" Y 8// JEy/nr y ATTORNEYSept. 10, 1963 F. F. CHELLIS ETAL 3,103,574

'. ARC IMAGE FURNACE Filed Dec. 5, 1959 5 Sheets-Sheet 2 \l I I I InINVENTORS, fled C/7 ///6 Pef'er E. Glaser BY Elissa/l r]. fiy/l'fij j &

ATTORN EY Sept. 10, 1963 F. F. CHELLIS ETAL 0 ARC IMAGE FURNACE FiledDec. 3, 1959 v s Sheets-Sheet 3 TIE 2/2 ATTORNE P 1963 F. F. CHELLISETAL 3,103,574

ARC IMAGE FURNACE Filed Dec. 5, 1959 5 Sheets-Sheet 4 INVENTORS BYRussell A 7/17 M i ATTORNEY Sept. 10, 1963 F. F. CHELLlS 'ETAL 3,103,574

ARC, IMAGE FURNACE Filed Dec. 5, 1959 5 Sheets-Sheet 5 -1 ww w j y/I Hi9 ATTORNEY INVENTORS, Fred E c/re/ns Ferer E Glaser BY ell J A 5m inUnited States Patent O ARC MAGE FURNACE Fred F. Chellis, Manchester, andPeter E. Glaser, Lexington, Mass., and Russell J. Ayling, Toledo; Ohio,assignors to The Strong Electric Corporation, Toledo, Ohio, acorporation of Delaware Filed Dec. 3, 1959, Ser. No. 857,975 17 Claims.(Cl. 219-34) This invention relates to a radiation image furnaceemploying an electric are as a radiant heat source and more especiallyto a furnace of this character provided with means for the concentrationof great heat intensity upon material to be heated.

It has been proposed to utilize an electric arc in connec tion with amirror system for producing extremely high temperatures in a small areabut such me ans heretofore employed for the purpose lacked adequatecontrols for practical operation and lacked stability of concentrationand intensity of the heat energy for efiicient use.

The present invention embraces the provision of a radiation furnaceembodying .a controlled are as a radiant heat source in combination withan energy projecting and refleeting system employing ellipsoidalreflectors arranged to concentrate and converge high intensity radiantheat upon the sample subjected to the heat.

Another object of the invention is to the provision of a meant PatentedSept. 10, 1963 FIGURE 4 is an end elevational view of the arrangementshown in FIGURE 3;

FIGURE 5 is a detail sectional view taken substantially on the line 5'5of FIGURE 3; 7

FIGURE 6 is a sectional view taken onthe line 6-6 of 7 FIGURE 3;

high intensity radiation image furnace wherein effective withoutappreciable loss of energy.

Another object of the invention resides in the mounting arrangements forthe components of a radiation image furnace employing an electric arc asa radiant heat source and utilizing ellipsoidal mirrors or reflectors asenergy transmitting means which are arranged for minute adjustments toeffectively control the transmission of the radiant energy and itsconcentration on a sample or specimen to obtain the most efiicientutilization of the radiant energy.

. Another object of the invention relates to a relatively movablesupplemental frame carrying one of the components of the energyconcentration system and the specimen to be subjected to the radiantenergy wherein the frame is movable for supporting a specimen. or samplein a horizontal or vertical position.

Further objects and advantages are within the scope of this inventionsuch as relate to the arrangement, operation and function of the relatedelements of the structure, to various details of construction and tocombinations of parts, elements per se, and to economics of manufactureand numerous other features as will be apparent from a consideration ofthespecification and drawing of a form of the invention, which may bepreferred, in which:

FIGURE 1 is a side elevational view of an arc producing means andradiation image furnace construction of the invention;

FIGURE Z'is a schematic illustration of the arrangement of energyconcentrating components of the radiation image furnace; I

FIGURE 3 is alongitudinal sectional view i lustrating the mounting meansfor one of the energy concentrating mirrors and adjustable means forcontrolling the amount of energy transmitted to the sample;

FIGURE 7 is a top plan view of the supplemental frame supporting certaincomponents of the furnace and mount in-g means for the sample;

FIGURE 8 is a sectional view taken substantially on the line ll8 ofFIGURE 7;

FIGURE 9 is a fragmentary sectional view taken substantially on the line9-9 of FIGURE 8;

FIGURE '10 is a sectional view illustrating an energy reflectingcomponent employed with the ellipsoidal energy transmission system whenthe specimen supporting means is in a vertical position;

FIGURE 11 is a detail view of an adjusting means forming a component ofthe furnace construction;

FIGURE 12 is a side elevational view of the means adapted to support thesample or specimen; FIGURE 13 is a sectional view taken substantially onthe line 1313 of FIGURE 7;

FIGURE 14 is an enlarged sectional view takensubstantially on the line14-14 of FIGURE 13;

FIGURE 15 is an enlarged sectional view taken substantially on the line1515 of FIGURE 12;

FIGURE 16 is asectional view taken substantially on the line 1616 ofFIGURE 12; V 1

FIGURE 17 is a view of the sample supporting means in vertical positionillustrating a modified form of actuating means for the movable frame; r

FIGURE 18 is a sectional yiew illustrating a cooling arrangement for amirror utilized with the sample in a vertical position;

FIGURE 19 is a detail View illustrating the strut connection for thesupplemental frame, and

FIGURE 20 is a front elevationalview of a control center forelectrically energized components for the furnace.

Referring to the drawings in detail, and initially. to FIGURE 1, thereis illustrated a main support or frame 10 providing a mounting for theunit 12 containing the are producing construction and control devicesfor the arc sourceof radiant energy and for supporting other componentsof the arc image furnace construction.

FIGURE 2 illustrates schematically the basic-optical componentsincluding an ellipsoidal mirror or curved reflector 14 which forms apart of the are producing unit 12 shown in FIGURE 1, a secondellipsoidal mirror or energy converging means 16 and .a diaphragm 18through which the radiant energy is projected from mirror 14 to themirror 16.

The source of radiant energy is an electric are 21 formed between apositive electrode 20 and a negative electrode 22, the are being at theprincipal focus of the ellipsoidal or curved mirror 14, the radiantenergy from the .are being reflected from mirror 14 to the mirror 16 andrereflected to the focus of the second mirror. As shown in FIGURES l and2, the mirrors 14 and 16 are spaced a distance equal to the sum ofthe'working distances of the two mirrors, the working distance being thedistance from the surface of a mirror to its far focus or its figure ofconfusion.

Arranged adjacent the axis ofthe ellipsoidal mirror 16 and near theprincipal focus of the mirrorld is a sample supporting means 24 which ismounted for adjustment through the medium of means hereinafterdescribed. The sample support is inclusive of a chamber 26 with a sampleS mounted therein.

The chamber may be composed of fused quartz or other transparentheat-resistant materials which do not appreciably impede thetransmission of the radiant energy. The chamber 26 may be provided withmeans for evacuating the same or filling the chamber with gases orliquids.

The are lamp or structural arrangement for producing the. electric areutilized as the radiant energy source includes 'a housing 30 supportedupon a member 32 mounted upon the supporting frame 10. The positiveelectrode or carbon 20 is supported by a suitable head 34 mounted upon apedestal 36. The electrode supporting head 34 is formed with aspherically shaped surface 38 "arranged't'o redirect heat energy fromthe are 21 through mirror 14; The positive electrode supporting'meansincludes a controlled arrangement (not shown) for feeding the electrode20 forwardly at a rate to compensate for the burning away of thematerial of the electrode.

' Thenegative electrode 22 is supported by a mounting means 44 which isangularly adjustable to dispose the .tip or extremityof the electrode 22slightly below the 'tip of the positive electrode 20 in producing an arcbetween the'electrodes'; A driving means (not shown) is providedfor thenegative electrode 22 for advancing this electrode at a rate tocompensate for the burning away of the material of the electrodes. Thedriving means for both thepositive and negative electrodes are motivatedby electric motors and suitable controls are provided to adjust the feedrates of the respective electrodes in order to maintain the are at theprincipal focus of the ellipsoidal reflector; 14.

As the driving and control means for the electrodes are of conventionalconstruction, they have not been shown in detail. The region of the arcflame is ventilated in order'to minimize the deposition of volatilesfrom the arc on the reflecting surface 40. A hollow shroud 48 isdisposed above and ,adjacent the negative electrode 22.

andis connected by means of ducts 49 and 58 with a blower 51 driven by amotor 52.

The rotation of the blower 51 exhaust-s air from the region of-the arethrough shroud 48 and conduits 49 and 50- for discharge through anexhaust pipe or chimney 53. An additional vent tube 54 is incommunication with the interior 'of thehousing 30 for ventilating of thehousing. Themotor 52-operates 'a second blower 55 which is connected bysuitable duct means, a portion of which is shown at 56, with thesupporting head 34 for the positive electrode '20 for delivering jets ofair toward the are formed at the extremity of the electrode 120*andgenerally along the positive electrode for bending the arc flame towardthe shroud 48.

, The apparatus above described for producing the are or source ofradiant heat is contained within'the housing 30 and the electrodescontrolled so 'as to maintain the are orsource of radiantheat at theprincipal focus of the ellipsoidal mirror 14. The electrodes and theelectrode feed control motors are supplied With electric current from asuitable power source. of thehousing is provided with an opening 33through which the radiant heat energy is projected by the mirror 14. v

The frame is provided with aplaten portion 66 upon which is mounted asupplemental frame 62 supporting the second ellipsoidal mirror orreflector, the sample supporting means and controls for regulating theamount of radiant energy projected onto the second mirror 16 and othercontrolling devices pertaining to the arc image furnace construction.The supplemental frame 62 is The front wall 31 4 articulately mountedwith respect to the radiant energy source and housing 30 containing thecomponents and controls for producing the arc.

With particular reference to FIGURES 1, 7, 8, lOand 11, the articulatelymounted means or supplemental frame 62 is carried bya pair of spacedpedestals or SUPPOTlIS 64 bolted or otherwise securely fastened to theplaten 603. The supplemental frame 62 includes a yoke-like member 66formed with spaced boss portions 68 which are bored to accommodate rodsor shafts 69 and 70, which, as shownin FIGURE 7, are arranged inparallelism. The distal ends of the rods 69 and 70 are held in spacedrelation by V means of a transversely extending member 72, shownparticularly in FIGURE 19.

The member 72 is formed with boss portions 73 bore to accommodate theends of the shafts 69 and 70. As shown in FIGURES 7 and 8, the member 66is formedwith upwardly extending boss portions 74 which are bored toaccommodate transversely align-ed pins or shafts 76 which form, pivotalsupports or trunnions for the mom ber 66. 'I hepins 76 are mounted byjournal bloclqs 78- secured to the upper ends of the pedestals 64. Theblocks, I

78 are equipped with set screws 79-which are drawn into engagement withthe pins 76to secure the pins in theblocks 78.

In this manner the supplemental frame 62 is supported- I for pivotal oranti-culate movement about the axis of the pins 76. The parallel rods orshafts 69 and 70 provide ways or track means supporting'components ofthe arc image furnace construction whereby certain of the com ponentsmay be adjusted lengthwise of the ways.

Mounted uponthe rods 69 and 70' is a member 82 upon which is mounted thesecond ellipsoidal mirror or re-- flector 1 6 The member 82 isof hollowconfiguration as shown in FIGURE 3 to accommodate the mirror 16 and isformed with a section 84 having boss portions 85- bored to receive therods 69and 70.

The boss portions 85 are of substantiallength in order.

phragm 87 provides a mask which is movable axially of the reflector 16along the rods 69 and7tl for regulating or controlling the amount ofheat'transmitted' to the reflector 16 from the reflector 14. Mountedupon the rod 70 is a bracket 90, shown in FIGURES 3 and 5, which may besecured to the rod by a pin 91'or other securing means.

A boss portion 93 formed on the central Web section 94 of member 66, isprovidedwith an opening to accom'm-odate a shaft 96 which is arranged inparallelism with the shaft 76 and which issecured to the boss 93' by apin 97. The diaphragm or heatjcontrollirrg means 87 is secured to amember 98 slidably mounted upon the shaft 96. The shaft 96 is formedwith a longitudinally extending spline or groove 99 and the bracket ormember '98 provided with'a key 100, shown in FIGURE 6,

.which cooperates with the spline 99 to prevent relative rotationbetween the shaft 96 and the bracket'98.

Rotatably supported in openings formed in boss por tion 102 of the arm90 and boss portion 104 on the web 94 is a threaded shaft 186. Thebracket 98 is (provided with a transverse projection ltl8'provided witha threaded.

b ore into which the shaft 106 is threaded'whereby notation of shaft 186effects longitudinal movement of the The supplemental frame 62 includingcomponents car- I ried thereby is movable or adjustable about the axesofthe trunnions or pins 76 from a horizontal position as shown inFIGURES 1 and 3 to a verticalposition illustrated in broken lines inFIGURE land in full lines in the form of the modification illustrated inFIGURE 17. FIGURES l, 7, 8, and-11 illustrate a manually operable meansfor adjusting the position of the frame structure62.

As particularly shown in FIGURES 7, 8 and 10 a yoke 114 is disposedbetween depending portions 115 of the member 66, the yoke being providedwith pins 116- which extend into bores formed in the depending portionsproviding a pivotal or articulate connection between the yoke 114 andmember 66, The yoke is provided with a boss 118 bored .to receive theend of a shaft 126 secured to the boss 118 by a pin 121. Disposedinteriorly of the base frame 10 and secured to suitable means providedtherein are brackets 122.

Disposed between the brackets 122 is a yoke 124 having boss portions 125and 126. The boss portion 125 is equipped with a pin 126 which isjournalled in the bracket 122. The boss 126 is bored to accommodate abearing sleeve or bushing 127 through which extends a shaft 128, theshaft being journally supported by the bracket 123 and bushing 127. Amitre pinion 131 is fixedly mounted on the shaft 128 and is in mesh witha mitregear 132 as shown in FIGURES 10 and 11.

The axial bore in the mitre gear 132 is threaded to cooperate with athreaded portion 134 of the shaft 120. The yoke 124 is formed with aboss portion 136 having an opening receiving a tenon portion 139 on thegear 132, an abutment or collar 140 being secured to the ten-on 139 onthe gear 132. Through this arrangement the gear 132 is rotatablerelative to the yoke 12 1 but is restrained against longitudinalmovement.

The end of the shaft 128 is provided with a polygonally shaped portion14-1 adapted to receive a crank or other suitable tool for rotating theshaft. When it is desired to change the position of the supplementalframe structure 62, the operator aflixes a crank to the shaft 128rotating the pinion 136 and the mitre gear 132, and through the threadedconnection between the mitre gear and the threadedv portion 134 of shaft12ththe frame may be raised to a vertical position or lowered asdesired. FIG- URES 1 and 7 illustrate the supplemental frame 621 in ahorizontal position with the axes of the mirrors 14 and 16 in alignedrelation.

FIGURE 10 illustrates the positions of the frame operating componentswith the frame 62 disposed in a vertical position. The mirror 16 issupported by the rectangularly shaped hollow member 82. The member 82 isformed with an inwardly extending flange 144 as shown in FIGURE 3.Welded or otherwise secured to the flange 144 are members 146 which arebored and threaded to accommodate respectively rods 147 and 143 shown inFIGURES 3 and 4. The rods 147 and 148 are provided respectively withmanipulating knobs 1 19' and 149'.

Arranged adjacent and peripherally of the mirror 16 is an annular memberor mirror support 156, lugs 151 being supported by the annular member150 and engaging the rim or periphery of the mirror 16. The rods 147 and148 extend through openings formed in the annular member 150, theextremities of the rods being provided with abutments or nuts 153, oneof which is shown in FIGURE 3.

Mounted on each of the rods and spaced from the annular member 150 is acollar 155, a coil spring 156 being disposed between the collar 155 andthe annular member 150 to resiliently retain the annular member and themirror 16 in a predetermined position dependent upon the adjustmenteffected through rotation of the rods 147 and 148.

The flange portion 144- at the lower region as viewed in FIGURE 3 isprovided with an opening to accommodate a rod 158, the forward end ofthe rod extending through the flange 144 and being provided With a nutor abutment 159. A spring 161} surrounds the rod and is disposed betweenthe flange 144 and the annular member 150, and a second spring 161surrounds the rod and is dis- 6 posed between the flange 1 14 and acollar 162 fixed to the rod. Through this arrangement the annular memberin the region of the rod 158 is resiliently held in a relativelystationary position. I

The reflector 16 may be tilted or adjusted about the rod 156 as a pivotZone by manipulation of the knobs 149 and 149, rotation of the knobsmoving the reflector 16 in angular positions for the purpose of causingthe radiant energy from the reflector 16 to be directed or convergedonto the sample or specimen S at the principal focus of the reflector asillustrated schematically in FIGURES 2 and 3.

Means is provided for visually determining the angles of convergence ofthe radiant energy from the reflector 16 to assure that the sample orspecimen is subjected to the concentration of flux from the mirror 16.

With the particular reference to FIGURES 3 and 6, there is disposedadjacent the diaphragm or temperature modulator 87 a relatively movablemask or door 166 which is articulately or pivotally secured to thetemperature modulator 87 by a hinge 168.

The temperature modulator plate 87 is provided with a cylindricaltubular member 176 in which is slidably mounted a latch or keeper 172connected to a flexible cable 173 for manipulating the latch 172. Thehinge structure 166 embodies a spring means 169 normally biasing themask 166 toward an open position, the latch 172 being arranged to retainthe mask 166 in a position as shown in FIGURES 3 and 6 blocking orinterrupting the projection of heat energy from the mirror 14-. The mask166 is adapted to be closed manually.

As shown in FIGURE 6, the mask 166 is provided with a plurality of smallopenings 17 6, there being four shown in FIGURE 6, which are equallyspaced from the center of the mask 166 aligned with the axis of themirrors when the mask is in energy flux obstructing position. Mountedupon the reflector supporting member 82 is a plate 178 provided with anopening 179. Secured to the plate adjacent the opening is arectangularly shaped frame or bracket 180 in which a member 182 of darkcolored glass is slidably supported having a finger grip portion 183' tofacilitate manual movement of the member. The crown of the reflector 16is provided with an opening 184. The axis of the openings 179 and 184-coincide with the axis of the mirror 16.

A rotatable plate or shutter 186 of circular contour is journallymounted by the housing of an electrically energizable motor 188, themotor housing being provided with a manipulating knob 189. The motorhousing is provided with a circular plate 1% which is held in frictionalcontact With the outer surface of the plate 176 by means of lugs 191arranged about the periphery of the circular plate 190.

The shutter 186 is formed with a circular opening 192 at a radialdistance from the axis of the shutter whereby it is adapted to bealigned with the axis of the mirror 16 during each revolution of theshutter. The shutter 186 is rotated for certain purposes hereinafterexplained. The operator, by grasping the manipulating grip 189, isenabled to adjust the housing of the motor 188 and the shutter 156 aboutthe axis of the motor in order to bring the opening 192 into alignmentwith the openings 179 and 184 as shown in FIGURE 3, when the motor 188is not energized.

When the operator desires to position the specimen S at the region ofthe principal focus of energy flux from the mirror 16, that is, at thepoint of convergence of the energy flux from the mirror, the mask 166 ismoved to closed or energy interrupting position as shown in FIG- URE 6.The are is then struck or formed between the electrodes 20 and 22,. andthe heat and light energy from the are projected through the severalsmall openings 176 in the mask 166 permitting minute rays of heat andlight energy to reach the reflector or mirror 16 for rereflection towardthe sample S.

' The purpose of the mask 166 is to block practically all "of the lightand heat energy while the operator makes the proper adjustments toconcentrate the energy on the sample or specimen S. With'the mask 166 inclosed position, the operator moves the housing of the motor 188manually to a position bringing the opening 192 in the shutter 186 inline with the axis of the mirror 16 as shown in FIGURE 3.

The operator is thus enabled to view the specimen S through the alignedopenings and by adjusting the specimen supporting mechanism to behereinafter described is enabled to adjust the position of the sample orspecimen atthe region of convergence of the energy reflected from themirror 16. In the embodiment illustrated, there are four openings 176 inthe mask 166, and four minute converging beams of light and heat energywill therefore be reflected from the mirror 16. When the operator hasmade the proper adjustments, these rays will appear as a single smallarea or point of light on the specimen. Thus through the use of thealigned sight openings 179, 184 and 192, and the mask 166 in closedposition, the operator is enabled to accurately position the samplewithout the eyes of the operator being subjected to the intense lightand heat energy which would otherwise be transmitted with the mask 166in open position. This arrangement likewise facilitates adjustment ofthe mirror 16 so that the energy flux converges at the focal point ofthe mirror 16. The shutter 182 may be pivotally supported upon the plate178 in lieu of the slidable mounting.

Disposed between the pedestals 64 supporting the frame 62 is a U-shapedmember 196, the turcations of which are provided with boss portions 198bored to accommodate the trunnion pins 76 as shown in FIGURES 8 and 9.The member 19 6 is fixedly secured to the pins by set screws 200. As thepins 76 are locked to the blocks 7'8 by set screws 79, the member 196 isheld in a relatively fixed position. Mounted upon the member 196 is anaperture plate 2112, shown in FIGURES l and 9, formed with an opening204 adjacent the zone of confusion of the maximum flux density, theopening 204 being defined by a frusto-conically shaped surface 206, thetaper of the surface being in substantial coincidence with the angle ofdivergence of the radiant energy projected through the opening towardthe mirror 16. The plate 262 is of sufiicient thickness to provide for acooling channel 208 connected with a coolant supply such as water bytubul'ar means (not shown). It is essential to employ 'a coolant for theaperture plate 202 by reason of its being positioned adjacent a regionof maximum concentration of radiant energy.

The invention is inclusive of means cooperating with the rotatableshutter 1 86 to enable the operator to inspect the sample through theopening 179 during the projection of radiant energy onto the sample. Asparticularly shown in FIGURES 9 and 10, the bi'ght portion 197 of memberI196 is bored to accommodate a tenon portion 210 of a housing 212containing reduction gearing. An electrically energizable reversiblemotor 214 is supported by the housing 212 and adapted to drive an outputshaft 216 through the reduction gearing contained within the housing212.

Secured on the shaft 216 is an arm 218 having at one extremity acircular disk or element 220. The disk 220 is positioned a distance fromthe axis of the shaft 216 so'that during rotation of the motor, the disk220 intermittently blocks or intercepts the energy flux which wouldnormally be projected through the aperture 204. The opposite end of thearm 218 is provided with a weight 222 which substantially balances thearm 21 8 about the axis of the shaft 216. Both motors 188 and 214 arepreferably of a high speed hysteresis type.

When the operator desires to examine the specimen or sample 8 withoutinterrupting the transmission of radiant energy for a sustained periodof time, the motors 188 and 214 are energized to simultaneously rotatethe disk 220 and the shutter 1 86. The motors operate at the same speedand the operator manually adjusts the position of the housing of themotor 188 by rotating the knob 189 to shift the relative angularposition of the aperture 192 so as to enable the synchronization of thedisk 2211 in a position blocking the energy aperture 204 at the sameinstant that the opening 192 in the shutter 186 is in registry with thesight opening 179.

Thus at each revolution of the disk 220 and the shutter 186, theoperator may visually inspect the specimen or sample through the sightopening 179 without viewing the light energy from the arc. The provisionof manual adjustment for the housing of the motor 1 8-8 driving theshut-ter 186 provides an effective means for quickly synchronizing theposition of the opening 192 in the shutter with the position of the disk220.

a higher frequency of interruption of the energy flux is desired, asimilar disk may be secured to the opposite end of the arm 218 in lieuof the weight 222 and a second opening formed in the shutter 186diametrically opposite the opening 192. In such arrangement the irequency of interruptions of the energy flux may be doubled withoutmodifying the rotational speed of the shutter 186 and the arm 218;

It is imperative that the disk 220 be maintained out of registrationwith the aperture 204- when the motor 214 is not rotating. Secured tothe member 196 is a two-pole magnet 224 and a similar two-pole magnet226 is secured to the arm 218, the magnets being in con- 'tiguousrelation as shown in FIGURE 9. Thus when current -flow to the motor 214is interrupted and the same comes to rest, the magnets 224 and 226 arepositioned 111 relation to each other so that the magnetic flux iseffective to maintain the arm 21 8 is a position with the disk 220 outof registration with the radiant energy flux. This avoids anypossibility of burning the disk 220.

- FIGURES 1, 7 and I12 through 16 illustrate means for supporting asample or specimen, the arrangement including adjustable componentswhereby the specimen may be adjusted in various directions to accuratelyposition the specimen or sample or a particular portion thereof in thezone of convergence or focal point of the energy transmitted orreflected from the ellipsoidal mirror 16.

The sample or specimen supporting arrangement is' mounted upon theparallel ways or rods 69 and 70.

As particularly shown in FIGURES 12 and 13, the

arrangement includes a plate-like member 23!) extending across the rods69 and 70. The member 230 is formed with portions 232 and 233 havingangular surfaces adapted to form a V-shaped configuration, the angularsurfaces engaging the rods 69 in the manner shown in FIGURE 13. Theconverging surfaces of portions 232 and 233 prevent transversedisplacement of the mounting plate 231 The portion of the plate 230adjacent the rod is formed with two longitudinally spaced pad portions235 adapted for engagement with the rod 70'. Disposed beneath the rods69 and 71] are transversely extending clamp plates 23 7 provided withthreaded openings accommodating bolts 239 which extend throughopenings'in lugs 240 formed on the plate 23 0. Through this arrangementthe mounting plate 231} may be adjusted lengthwise of the ways or rods'69- and 7d and clamped in an adjusted position.

The mounting plate 230 supports a member 242vvhic'h is slidably mountedby means of a dove-tail configuration formed on a member 244- which issecured to the mounting plate 230 by means of screws 246. As shown inFIG- URE 12, there is secured to an end region of the mounting plate231) a motor mounting 248 which supports a reversible motor 250[contained within a suitable sheet metal casing 251.

The motor 250 is provided with high ratio speed reducing gearing, theoutput shaft 252 of the motor being coupled to a lead screw 254 throughthe medium of a coupling 256.

The threaded or spiral portion of the lead screw 254 cooperates with athreaded opening in the slide 242 whereby rotation of the reversiblemotor 25% rotates the lead screw in one direction or the other to movethe slide 242 lengthwise of the mounting plate 230.

The slide 242 supports a member 260 which is secured to the member 242by means of bolts 262 and is formed with a dove-tail configurationadapted to receive a tang portion 264 formed on a transverse slide 266as p=articu larly shown in FIGURES 13 and 14. Secured to the member 268by mounting means 268 is a motor 278 provided with high ratio speedreducing gearing. The output shaft 272 of the motor 276 is coupled to alead screw 276, the lead screw being threaded into a threaded bore inthe transverse slide 266.

A rectangul arly shaped sheet metal casing 278 encloses the slides 242and 266 to prevent the ingress of foreign matter into the wayssupporting the slides and associated components. Secured to the slide266 is a bracket 288 and an upwardly extending leg of the bnacket 280 issecured to a tubular casing or member 282 fastened to the bracket bymeans of rivets 283. One wall 284 of the rectangularly shaped housing282 projects upwardly beyond the remaining walls as shown in FIG- URE13.

Secured to the'wall portion 284 is a vertically disposed member 286having a dove-tailed configuration adapted to slidably receive a tang288 of a vertical slide 290 as shown in FIGURES 12, 13 and 15. A sheetmetal housing 292 encloses the-member 286 and associated components.

Secured to the tubular housing 282 and the member 286 is a motormounting 294 which supports a motor 298. The motor 298 is of the sameconstruction as motors 258 and 270, the output shaft thereof beingcoupled with a lead screw 308 which is threaded into a threaded bore inthe vertical slide 290. V

The vertical slide 296 supports upwardly extending plates 302 and 304,the plates being connected to a U- shaped bracket 30 6 by means ofrivets 307. The bracket 306 is provided with a mounting plate 308 towhich is secured a platform 310 adapted to carry a sample or specimenmounting 312 arranged to support a sample or specimen 314. The motor 298is reversible to elevate or lower the bracket 306.

The motors 256, 270 and 298 are of theh-igh speed type, the armaturesrotating at several thousand r.p.m. and the reduction gearing associatedwith each motor reduces the speed so that the output shafts rotate atapproximately 30 r.p.m. Through this arrangement very small high speedmotors may be used and sufficient power derived through the high ratioreduction to drive the longitudinal, transverse and vertical slides at acomparatively low speed.

A flat plate 279 having an opening to accommodate the upwardly extendinghousing or casing 282 and the upwardly extending leg of bracket 280 liesupon the upper surface of the horizontal portion of housing 278 and ismovable with the housing 282 during longitudinal and transverseadjustments. The plate 279 serves to close the enlarged opening in thehousing 278 to accommodate movements of the casing or housing 282,thereby providing an enclosure for the slides 242 and 266 and associatedmechanism.

Through the arrangement above described, a substantially universaladjustment is provided for the specimen or sample support 310.Energization of the motor 250 moves the longitudinally movable slide242, the bnacket 280, housing 282 and specimen support 310 in adirection longitudinally of the axis of the mirror 16. Energization ofthe motor 270 moves the slide 266, housing 10 282 and support 310 indirections transversely of the axis of the mirror 16, and energizationof the motor 298 effects vertical movement of the members 302, 304 andthe support 310 so that the specimen may be adjusted in a verticalplane.

A control box 318 for the several electrically energized components ofthe mechanism is illustrated in FIGURE 20 mounted on the member 82. Theswitches on the box are of manually operable toggle type. In the centralneutral position of the toggle switches the motors are deenergized, inone angular position of each switch its respective motor is driven inone direction and in another angular postion of the toggle member, themotor is driven in the opposite direction. In FIGURE 20 the toggleswitch 320 controls the motor 270 for moving the transverse slide 266.

The toggle switch 321 actuates or controls the motor 298 for raising andlowering the specimen support 310. The toggle switch 322 controls themotor 250 for moving the longitudinal slide lengthwise of the axis ofthe reflector to bring the specimen to the focal point of the mirror 16.The toggle switch 323 controls the motor 112 for moving the temperaturemodulator or mask 87 lengthwise of the principal axis of the mirrors.Toggle switch 324 controls both motors 188 and 214 for rotating theshutters 186 and 220.

The control center or box 318 includes a master motor speed controlmember 325 which regulates the speed of the several motors 278, 112,25th and 298, An emergency stop switch controlled by a knob 319 is alsocontained in the control box 318 adapted to interrupt the power supplyto the apparatus.

The components of the apparatus forwardly of the housing enclosing theare producing mechanism, the supplemental frame 62 and the mirror 16 andsupporting means are contained in a sheet metal housing 326 shown insection in FIGURE 1. The housing is fashioned in two sections 327 and328 which are removably joined together in a diagonal region or planeindicated at 329 passing through the axis of the trunnion pins 76.

The section 327 of the enclosure 326 is secured to the member 82supporting the mirror 16 and to the rods 69 and 70 by suitable means(not shown). The section 328 is made removable to facilitate adjustmentof the supplemental irarne to a vertical position as hereinafterdescribed. The transverse wall 330 of the housing section 328 is formedwith an aperture bounded by a flange 331 in which is slidalblytelescoped a collar 332. The collar is adjustable in order that the samemay be engaged with the wall 31 of the arc enclosing housing at a regionsurrounding the aperture 33.

The frame structure 62 is movable about the axis of the trunnion pins 76to 'a position wherein the ways or shafts 69 and 70 are disposed in avertical position and with the specimen support mounted in a verticalposition as shown in broken lines in FIGURE 1.

A vertical position of the specimen is particularly advantageous wherethe specimen provides its own container and a region thereof fused bydownwardly directed radiant energy from the mirror 16 when disposed withits axis in a vertical position. When the mechanism is adjusted to thevertical position shown in broken lines in FIGURE 1, a strut 336 isconnected with the bracket 72 as shown in FIGURES 17 and 19 by means ofa pin 338, the other end of the strut being connected to a fitting 340by means of a removable pin 342.

When the arrangement is in horizontal position, the use of the strut 336is dispensed with by removing the pins 338 and 342. The function of thestrut is to stabilize or lend rigidity to the mechanism when the same isadjusted to or disposed in a vertical position. With the mirrorarrangement of the furnace construction disposed in a vertical position,means is provided at the axis of the trunnion pins 76 for redirectingradiant energy from 11' the mirror 14 to the mirror 16 when the axis ofone mirror is normal to the axis of the other.

FIGURES and 17 show the arrangement of supplemental energy reflectingmeans in position adjacent the trunnion pins 76, and FIGURE 18illustrates the arrangement for adjusting the position of the energyreflecting means and water cooling the same. Frame member 66 formed witha pad portion 345 adapted to accommodate a bracket or fitting 3-46 whichis adapted to be mounted on the pad by means of removable screws 348.

The supplemental reflecting means comprises a planar mirror 350 mountedwithin a rectangularly shaped metal casing or frame 352, a gasket 353being arranged between the mirror and a peripheral flange of the casingfor effecting a sealed structure. Disposed at the obverse side of themirror 350 is a plate 356 provided with a peripheral grooveaccommodating a sealing gasket 3 58 which engages the mirror. Thecentral region of the plate 3 56 is recessed as at 360 providing achamber to accommodate cooling fluid such as water.

The plate is provided with a suitable inlet tube 363 and an outlet tube365 to; convey circulating cooling water through the chamber or recess360 from a water supply. The bracket 346 is provided with at least threethreaded openings adapted to accommodate the threaded portions ofadjusting members 367, the members being provided with knurledmanipulating knobs 368. Each of the adjusting members 367 is formed atits end with a ball or spherically-shaped portion 370 which is disposedin a socket formed in a fitting 372 secured to the plate 356 asparticularly shown in FIGURE 18.

In the embodiment illustrated, three adjusting screws 3 67 are employedspaced to provide for a universal adjustment of the planar mirror 350 Bymanipulating the knobs 368 of the screws, the operator is enabled toredirect the radiant energy from the mirror 14 passing through theaperture 204 in plate 202 onto the surface of the mirror 16 when theaxis of mirror 16 is in a substantially vertical position fortransmission to the specimen or sample S.

It is desirable to coat the obverse surface 351 of the mirror 350 toeffect eflicient reflection of the radiant energy to the mirror 16. Ithas been found that the surface 351 of the mirror coated with evaporatedaluminum and silicon monoxide provides higher energy reflectingefficiency and such coating materials are not appreciably impaired bythe high temperatures of the radiant heat energy. The fitting 346carrying the mirror 350 is removably carried by the frame member 66 asit is used only when the frame 62 is arranged in a vertical position asshown in broken lines in FIGURE 1 and in FIGURE 17. I FIGURE 17 includesa modified form of means for moving the articulately supported frame 62from a horizontal to avertical position. In this form the pins 116journalled in openings in frame member 66 are carried by a U-shaped yoke380 which is connected with a piston rod 381 forming a part of a fluidactuator 382. The

rod 381 extends into a cylinder 3 84 of the actuator and is equippedwith a piston 386 reciprocable in the cylinder.

The lower end of the cylinder is provided with a tenon portion 3-88which accommodates a pivot shaft 390 carried by a bracket 391 which issecured to a frame member 3 92 forming part of the main frame structureof the apparatus. Connected to the upper and lower end regions 12 formof construction shown in FIGURE 1 and fluid under pressure such as oilor compresed air is introduced into the upper end of'the cylinder 384through the duct or tube 394.

The pressure fluid moves the piston 386 downwardly, which action effectspivotal movement of frame 62. about the trunnion pins 76 until theframereaches a horizontal position. When it is desired to move the frame62 into a vertical position, fluid under pressure is introduced into theopposite end of the cylinder through the tube 396. The strut 336 maythen be replaced in the position shown in FIGURE 17 to lend stability tothe structure in such position.

If desired, the interior of the housing 326 may be ventilated by meansof a suitable blower (not shown). The arc image furnace of the inventionprovides a concentration system for radiant energy of improvedefiiciency and capable, of producing temperatures at the region of thesample or specimen of upwards of 3500 C. or more. A higher temperaturefurnace of this character facilitates fusion of samples where thesample'provides its own container thus avoiding contamination Theuniversal, adjustment provided for the sample facilitates theconcentration of maximum energy flux' at a desired point or area and theheat modulator enables accurate control of the amount of energy directedonto the sample.

It is apparent that, within the scope of the invention, modificationsand different arrangements may be made other than-as herein disclosed,and the present disclosure is illustrative merely, the inventioncomprehending all variations thereof.

We claim:

1. Apparatus of the character disclosed, in combination, a pair ofelectrodes adapted to form an arc upon current flow through theelectrodes, a first curved mirror disposed with the are at theprincip-alfocus thereof, a frame, :a second curved mirror mounted upon the frameand disposed to receive radiant energy from the arc reflected from thefirst mirror, means mounting the second mirror for adjusting theposition of said second mirror relative to the frame, a sample supportassociated with ror disposed with the are at the principal focusthereof, a support, a frame articulately mounted on the support, a

second ellipsoidal mirror mounted upon the frame and disposed to'receive radiant energy from the arc reflected from the first ellipsoidalmirror, a sample support dis- 'posedin the region of the principal focusof the second ellipsoidal mirror, means carried by said frame adjustablymounting the sample support, adjustably mounted means for modulatingradiant energy fluxfrom the first mirror to the second mirror, meansassociated with said frame arranged to move the frame relative to thefirst ellipsoidal mirror, and radiant energy deflecting meansforwdirecting radiant energy flux from the-first ellipsoidal mirror tothe second ellipsoidal mirror when the axes of the ellipsoidal mirrorsare in angular relation. 3. Apparatus of the character disclosed, incombination, a pair of electrodes adapted to form an are upon currentflow through the electrodes, a first ellipsoidal mirror disposed withthe are at the principal focus thereof, a support, a frame articulatelymounted on the support, a second ellipsoidal mirror mounted upon theframe and disposed to receive radiant energy from the are reflected fromthe first ellipsoidal mirror, a sample support dis-. posed in the regionof the principal focus of the second 13 ellipsoidal mirror, meanscarried by said frame adjustably mounting the sample support, adjustablymounted means for modulating radiant energy projected from said firstmirror to said second mirror, and means for adjusting said second mirrorrelative to the frame.

4. Apparatus of the character disclosed, in combination, a pair ofelectrodes adapted to form an are upon current flow through theelectrodes, a first ellipsoidal mirror disposed with the are at theprincipal focus thereof, a support, a frame articulately mounted on thesupport, a second ellipsoidal mirror mounted upon the frame and disposedto receive radiant energy flux from the are reflected from the firstellipsoidal mirror, a sample support disposed in the region of theprincipal focus of the second ellipsoidal mirror, means carried by saidframe adjustably mounting the sample support, a housing enclosing saidelectrodes and said first ellipsoidal mirror, a second housing mountedby said frame enclosing the second ellipsoidal mirror, and means foradjusting the position of said frame and second housing relative to saidfirst housing.

5. Apparatus of the character dis-closed, in combination, a pair ofelectrodes adapted to form an are upon current flow through theelectrodes, mounting means for the electrodes, a first ellipsoidalmirror disposed with its focus substantially coincident with the arc, asecond ellipsoidal mirror, a support, a frame mounted by the support,said second ellipsoidal mirror being mounted on said frame, a samplesupporting member disposed in the region of the principal focus of thesecond ellipsoidal mirror, means carried by said frame associated withthe sample supporting member for adjusting the position of the saidsample supporting member, electrically energizable means for actuatingsaid member adjusting means, a platehavingan opening (formed therein forcontrolling radiation directed toward the second ellipsoidal mirror,

at relatively movable mask arranged to obstruct radiant energy at theopening in said plate, said mask being provided with a plurality ofsmall energy flux transmitting openings, and a sight opening in thesecond ellipsoidal mirror whereby the paths of the energy may bevisually inspected to determine the path of the energy flux 'withrespect to a sample mounted by the sample supporting member.

6. Apparatus of the character disclosed, in combination, a pair ofelectrodes adapted to form an are upon current flow through theelectrodes, mounting means for the electrodes, a first ellipsoidalmirror disposed with its focus substantially coincident with the arc, asecond cl lipsoidal mirror, a support, a frame mounted by the support,said second ellipsoidal mirror being carried on said frame and disposedto receive radiant energy from the arc reflected from the first mirror,a plate formed with an opening of defined area, the center of theopening in the plate being substantially coincident with the axis of thesecond mirror, said plate being supported for movement along the axis ofthe second mirror for modulating radiant energy flux from the arcreflected from the first mirror, means for moving the plate, a doorpivotally mounted on said plate and arranged when in closed position tocover the opening in the plate, spring means normally biasing the doortoward open position, said door being manually movable to closedposition, a keeper arranged to retain said door in closed position,means for actuating the keeper to release the door for movement to openposition under the influence of the spring means, a sample supportingmember disposed in the region of the principal focus of the secondmirror, means carried by the frame adjustably mounting the samplesupporting member, said door being provided with a plurality of smallenergy flux transmitting openings, and a sight opening in the secondmirror whereby the paths of energy flux passing through the openings insaid door may be visually inspected to determine the path of the energyflux with 14 respect to a sample mounted by the sample supportingmember.

7. Apparatus of the character disclosed, in combination, a pair ofelectrodes adapted to form an are upon current flow through theelectrodes, a first ellipsoidal mirror disposed with the are at theprincipal focus thereof, a support, a frame articulately mounted on thesupport adapted for adjustment to horizontal and vertical positionsrelative to the axis of the first ellipsoidal mirror, at secondellipsoidal mirror mounted upon the frame, means mounting said secondellipsoidal mirror on the frame for adjusting the relative position ofsaid second ellipsoidal mirror, a sample support disposed in the regionof the principal focus of said second ellipsoidal mirror, meansassociated with said frame for adjusting the relative position of thesample support, a temperature modulator associated with the frame, meansfor adjusting the temperature modulator for regulating the radiantenergy flux projected to the second ellipsoidal mirror, electricallyenergizable means for adjusting the sample support, and radiant energydeflecting means for directing radiant energy to the second ellipsoidalmirror when the axes of the ellipsoidal mirrors are in angular relation.

8. Apparatus of the character disclosed, in combination, a pair ofelectrodes adapted to form an are upon current flow through theelectrodes, a first ellipsoidal mirror disposed with the arc at theprincipal focus thereof, a support, a frame mounted on the support, asecond ellipsoidal mirror mounted upon the frame and disposed to receiveradiant energy from the arc reflected from the first ellipsoidal mirror,means mounting said second ellipsoidal mirror for adjusting the relativeposition of said second ellipsoidal mirror, a sample support disposed inthe region of the principal focus of said second ellipsoidal mirror,means associated with said frame for adjusting the position of thesample support in longitudinal, transverse and vertical directions, atemperature modulator associated with the frame, electricallyenergizable means for adjusting the temperature modulator for regulatingradiant energy flux to the second ellipsoidal mirror, and electricallyenergizable means for actuating the adjusting means for the samplesupport.

9. An arc image furnace comprising, in combination, a pair of electrodesadapted to form an are upon current flow through the electrodes,mounting means for the electrodes, a first ellipsoidal mirror disposedwith its principal focus substantially coincident with the arc, a secondellipsoidal mirror, a support, a frame mounted by the support, saidsecond ellipsoidal mirror being carried by said frame, a samplesupporting member disposed in the region of the principal focus of thesecond ellipsoidal mirror, means carried by said frame associated withthe sample suppor ing member for adjusting the position of the saidmember, means for intemittent-ly obstructing radiant energy flux fromsaid first ellipsoidal reflector at the zone of least confusion, a platerotaitably supported adjacent the second ellipsoidal reflector andre-arw ardly thereof, said plate and said second ellipsoidal reflectoreach having an opening formed therein, and means tor rotating saidenergy obstructing means and said plate in synchronism whereby theradiant energy is obstructed simultaneously with the registration of theopening in said plate with the open-ing in said reflector to facilitatevisual inspection of the sample.

10. An arc image furnace comprising, in combination,

, a pair of electrodes adapted to form an arc upon current flow throughthe electrodes, mounting means for the electrodes, a first ellipsoidalmirror disposed with its focus substantially coincident with the arc, asecond ellipsoidal mirror, a support, a frame mounted by the support,said second ellipsoidal mirror carried on said frame, a samplesupporting member disposed in the region of the principal focus of thesecond ellipsoidal mirror, electrically energizable mean-s I associatedwith the sample supporting member for adjusting the position" of thesaid member, rotatable means for intermittently obstructing radiantenergy flux from said first ellipsoidal reflector at the zone of leastconfusion, a plate rotatably supported adjacent the second ellipsoidalreflector and rearwardly thereof, said plate and said second ellipsoidalreflector each having an opening formed therein, means forrotating saidenergy. flux obstructing means and said plate in synchronism whereby theradiant energy is obstructed simultaneously with the registration of theopening in said plate with the opening in said reflector to facilitatevisual inspection of the sample, and magnetic means for normallymaintaining said energy flux obstructing means out of the path of theenergy flux.

11. An arc image furnace comprising, in combination,

i a pair of electrodes adapted to formarr arc uponcurrent l flow throughthe electrodes, mounting means for the electrodes, a first ellipsoidalmirror disposed with its principal focus substantially coincident withthe arc, a second ellipsoidal mirror, a support, a frame mounted bythesupport;

said second ellipsoidal mirror being carried by said frame,

a sample supporting member disposed in thelregion of the principal focusof the second ellipsoidal mirror, means carried by saidflframeassociated with. the sample supporting member for adjusting the positionof the said member, movable means for intermittently obstructing radiantenergy flux from said first ellipsoidal reflector at. the zone of leastconfusion, and shutter means movable in. synchronism with said energyflux obstructing means to facilitate visual inspection of the samplewhen the latter is subjected to radiant energy from the arc.

12. An arc image furnace of the character disclosed, in combination, apair of electrodes adapted to form'an ,are upon current flow through theelectrodes, mounting electrically energizable means for adjusting theposition of said temperature modulator relative to the path of radiantenergy flux, a sample support disposed in the region of the principalfocus of the second ellipsoidal mirror, an element associated with therods, and means adjustable relative to said element. for controlling theposition of the sample support relative to the principal I focus of thesecond ellipsoidal reflector.

13. An arc image furnace of the character disclosed, in combination, apair of elcctrodesadapted to form an arc upon current flow through theelectrodes, mounting means for the electrodes, said mounting means beingadapted to maintain the arc in a relatively fixed position,

a first ellipsoidal mirror disposed with its principal focussubstantially coincident with the arc, a second ellipsoidal mirror, asupport, a frame mounted by the support, said frame including a pair ofsubstantially parallel rods, means securingthe rods in spaced relation,a sample ,sup porting means disposed in the region of the principalfocus of the second ellipsoidal mirror, said sample supporting meansincluding a platform supported by said rods, a member mounted-on saidplatform and adjustable relative to the platform and lengthwise of saidrods, second member supported upon said first member and adjustable indirections transversely of said rods, a third member extending upwardlyfrom said second member and mounted thereon, said third member mountingsaid sample support and being adjustablein directions normal to the axisof said second ellipsoidal reflector, electrically cnergiza-blc meansfor adjusting the, relative position of lit said first, second and thirdmembers, and manually operable switch means individual to eachelectrically energizable means to effect universal adjustment of thesample. I

14. An arc image furnace of the character disclosed, in combination, apair of electrodes adapted to form an are upon current flow through theelectrodes, mounting means forsthe electrodes, said mounting: meansbeing;

adapted to maintain the arc in a relatively fixed position, a firstellipsoidal mirror disposed with its focus substantially coincident withthe are, 'a second ellipsoidal mirror, a support, a frame mounted by thesupport, .said

frame including a pair of substantially parallel rods,

means securing therods in spaced relation, a temperature modulatingmember, means associated with said rods arranged: to support thetemperature modulating ,member, electrically energizable means foradjusting the position of said temperature modulator relative to theradiant energy flux, 21 sample supporting means disposed in the regionofthe principal focus of the second ellipsoidal mirror, said samplesupponting' means including an element supported by said rods, a membermounted on said element and adjustable relative thereto, second membersupported upon said'frrst member and adjustable relative thereto, athird membermountedrby said second mem-l' her, said third membercarrying said sample support and being adjustable relative to the secondmember, electrically enengizable means for adjusting the relativeposition of said first, second and third members, and manually operableswitch means individual to each electrically energizable means to effectuniversal adjustment of the sample.

, 15. An arc image furnace'of the character disclosed, in combination, apair of electrodes adapted'to form an are upon current. flow through theelectrodes, a first ellipsoidal mirror disposed with the arc at theprincipal focus. thereof, a support, .a frame articulately mounted onthe support adapted for adjustment to horizontal and vertical positionsrelative to the axis of the first ellipsoidal mirror, a secondellipsoidal mirror mounted upon the frame and disposed to receiveradiant energy from the arc reflected from the first ellipsoidal mirror,means mounting said second ellipsoidal mirror for adjusting the relativeposition of said second ellipsoidal mirror, a.

sample support disposed in the region of the principal focus of saidsecond ellipsoidal mirror,.means associated with said'frame foradjusting the relative position, of

the sample support, a temperature modulator associated.

with the frame, means forzadjusting the temperature modulator forregulating the amountof radiantenergy projected to the second,ellipsoidal .,rnirror, a housing a second ellipsoidal mirror mounteduponthe frame and disposed to receive radiant energy from the arereflected from the first ellipsoidal mirror, means mounting said secondellipsoidal mirror for adjusting the relative position of said secondellipsoidal mirror, a sample support disposed in the region of. theprincipal focus of said second ellipsoidal mirror, means associated withsaid frame for adjusting the relative position of the sample support,l

a housing enclosing the electrodes and said first ellipsoidal mirror, asecond housing enclosing saidsecond ellipsoidal mirror and the samplesupporting and adjusting means, a

third housing disposed between said first and second.

housings, said second and third housings being in engagement at adiagonal plane through the articulate mounting of the frame, said secondhousing being movable with said frame to a vertical position, and saidthird housing being reversible and adapted to engage said first andsecond housings when the second housing is disposed in a verticalposition.

17. An arc image. furnace of the character disclosed, in combination, apair of electrodes adapted to form an are upon current flow through theelectrodes, a first ellipsoidal mirror disposed with the arc at theprincipal focus thereof, a support, a frame articulately mounted on thesupport adapted for adjustment to horizontal and vertical positionsrelative to the axis of the first ellipsoidal mirror, a secondellipsoidal mirror mounted upon the frame and disposed to receiveradiant energy from the arc reflected from the first ellipsoidal mirror,means mounting said second ellipsoidal mirror for adjusting the relativeposition of said second ellipsoidal mirror, a sample support disposed inthe region of the principal focus of said second ellipsoidal mirror,means associated with said frame for adjusting the relative position ofthe sample support, a temperature modulator associated with the frame,means for adjusting the temperature modulator for regulating the amountof radiant energy projected to the second ellipsoidal mirror, a firsthousing enclosing the electrodes and said first ellipsoidal mirror, asecond housing enclosing said second ellipsoidal mirror, the samplesupporting and adjusting means and the temperature modulator, a housingsection disposed between said first and second housings, said secondhousing and housing section being engaged about a diagonal plane throughthe articulate mounting of the frame, a collar carried by said thirdhousing and engageable With said with said first housing, said secondhousing being movable with said frame to a vertical position, saidhousing section being reversible and adapted to engage the said secondhousing in vertical position with the collar in engagement with saidfirst housing, means for adjusting the angular position of said frame,and removable strut means for securing said frame in rigid position whensaid frame is adjusted with the axes of said ellipsoidal mirrors innormal relation.

References Cited in the file of this patent UNITED STATES PATENTS2,819,649 McLeod et a1. Ian. 14, 1958 2,861,166 Cargill Nov. 18, 19582,927,187 Wendelken Mar. 1, 1960 3,001,055 Lozier et al Sept. 19, 1961FOREIGN PATENTS 1,061,592 France Nov. 25, 1953 OTHER REFERENCES CarbonArc Image Furnace, by Null and Lozier, The Review of ScientificInstruments, vol. 29-, No. 2, February 1958, pages 163 to 170.

1. APPARATUS OF THE CHARACTER DISCLOSED, IN COMBINATION, A PAIR OFELECTRODES ADAPTED TO FORM AN ARC UPON CURRENT FLOW THROUGH THEELECTRODES, A FIRST CURVED MIRROR DISPOSED WITH THE ARC AT THE PRINCIPALFOCUS THEREOF, A FRAME, A SECOND CURVED MIRROR MOUNTED UPON THE FRAMEAND DISPOSED TO RECEIVE RADIANT ENERGY FROM THE ARC REFLECTED FROM THEFIRST MIRROR, MEANS MOUNTING THE SECOND MIRROR FOR ADJUSTING THEPOSITION OF SAID SECOND MIRROR RELATIVE TO THE FRAME, A SAMPLE SUPPORTASSOCIATED WITH THE FRAME AND DISPOSED IN THE REGION OF THE PRINCIPALFOCUS OF SAID SECOND MIRROR, MEANS MOUNTING THE SAMPLE SUPPORT UPON THEFRAME ARRANGED FOR ADJUSTING THE POSITION OF THE SAMPLE SUPPORT INLONGITUDINAL, TRANSVERSE AND VERTICAL DIRECTIONS RELATIVE TO THE SECONDMIRROR, AND ELECTRICALLY ENERGIZABLE MEANS FOR ACTUATING THE ADJUSTINGMEANS FOR THE SAMPLE SUPPORT.